I'm very new with NX simulations, but was hoping someone could give me some guidance on how to proceed with this problem.
I am trying to set up a simulation for a diesel flame test for a hydrogen storage tank. The hydrogen has an initial temperature of -193 C and is exposed to a flame of 827 C for 30 minutes. The final temperature of the hydrogen after those 30 minutes must be below -90 C.
As the pictures show, I have four solids. The innermost region is the hydrogen, which I created an initial conditions constraint for the temperature. The next three layers are the tank and insulation layers which I defined the material properties for. I have surface to surface contacts for the layers that are touching and then a convection constraint on the outermost layer with the ambient termperature defined as 827 C.
I am trying to get a transient solution, but I'm not sure that the conduction heat transfer is being properly analyzed. The outer surface seems to correctly start at an intial temperature of 20 C and then increase with time, but the inner layers look they quickly jump to a new temperature, then remain there until the simulation is finished.